Table 3.
Chemistry in pool water samples (according to DIN 19643-1) and number of visitors per year (date from the questionnaire).
| Hospital Number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Visitors/per year | 2500 | 7200 | 4500 | 4500 | 10,800 | 1680 | 1450 | 35,000 | 3000 | <50 | 300 |
| THM (mg/L) | 0.0 | 0.007 | 0.006 | 0.000 | 0.005 | 0.000 | 0.001 | 0.008 | 0.000 | 0.002 | 0.000 |
| Bromate (mg/L) | 0.055 | <LOD | <LOQ | 0.009 | 0.011 | 0.054 | 0.003 | 0.005 | 0.005 | 0.004 | 0.005 |
| Chlorate and chlorite (mg/L) | 18.0 | 2.0 | 0.8 | 3.2 | 2.1 | 33.5 a | 9.0 | 4.7 | 5.4 | 16.1 | 9.2 |
| Al (mg/L) | 0.06 a | 0.07 a | <LOQ | 0.07 a | <LOQ | 0.07 a | <LOQ | 0.08 a | <LOQ | 0.1 a | 0.08 a |
| Fe (mg/L) | <LOQ | <LOQ | <LOQ | <LOQ | <LOQ | <LOQ | <LOQ | <LOQ | <LOQ | 0.0 | <LOQ |
| pH | 6.7 | 7.0 | 7.0 | 7.2 | 7.3 | 6.7 | 7.1 | 7.2 | 6.7 | 7.2 | 7.5 |
| KS4.3 (mmol/L) | 0.3 b | 0.9 | 0.6 b | 0.9 | 0.71 | 0.2 b | 0.4 b | 1.0 | 0.2 b | 0.5 b | 1.3 |
| Nitrate (mg/L) | 10.8 | 7.5 | 28.8 a | 26.8 a | 14.3 | 30.0 a | <NG | 3.5 | 13.3 | 30.7 a | 14.3 |
| Ox (mg/L) | 0.7 | 0.5 | 0.7 | 0.5 | 1.4 | <LOD | 0.4 | 0.9 a | 0.3 | 0.3 | 1.0 a |
| Redox (mV) | 780.80 | 821.50 | 806.00 | 738.30 b | 819.30 | 767.00 | 675.00 b | 716.30 b | 823.00 | 803.30 | 919.00 |
| Free chlorine (mg/L) | 0.51 | 0.72 a | 0.40 | 0.27 b | 0.50 | 0.33 | 0.54 | 0.77 a | 0.46 | 0.49 | 0.59 |
| Bound chlorine (mg/L) | 0.11 | 0.15 | 0.06 | 0.06 | 0.06 | 0.01 | 0.03 | 0.25 a | 0.04 | 0.02 | 0.02 |
<LOD = below limit of detection; <LOQ = below limit of quantification; a above requirements acc. DIN 19643-1; b below requirements acc. DIN 19643-1 [21].